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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78890099a7d5053ab03aaca5e4ddedc7fbd2c1fa4f513aafffcc0842ca2ab813' 
  AND token = 'otDbO/QrZ6KnJXXH3JWrb5wx4bRybV/PPn3eoDNik/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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