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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61708851287cd3548b63697f87f90d9c68a761728276e52be75922678f9db784' 
  AND token = 'T7xmOHtue1gbIXMFzU4tL6RTDXpfXynQS26TVHoa7n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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