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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccbfff31cfb5d146a57edc76d510741098dca532b9d5a119393d32eebb9d0543' 
  AND token = 't8RTwjFQLqTlwfWn23Z2Z9YpmWaKtu3lR6so+3Ce2wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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