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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6788668a31e00efcd4706f48120a8845b1a0d4be2e2a0b7804c006ef39b919e2' 
  AND token = 'tPPgp4Lo4wbd3VI6XAOKs1CkpRQkPIINu9u5Dpd1vDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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