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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a0d6418be339e9c39f6cc2bc0c919cd6b240ec1722ca03da301815ac0cbf7fc' 
  AND token = 'UzlI604L1EQluc7XC9ZrkoTsBt/Z2JU3uVrqSwWl9tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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