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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56bbb4ff9e19566126cbfcb758be4c2e441887cdf0005a66f20235422ff620f6' 
  AND token = 'psavEri3E/0rpAVaL5aH0ifaCibVzCbB6sAR6Fgel2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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