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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae91b328fcf2048ab8ac03bbecfced7cef5798fdc2a7432fba1f126a6389d7a6' 
  AND token = 'W7VO1OaiFU6iYQmxGlcyG8VARTEi2MHDcqt22bWySrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}