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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10fab30bb948cd7b58862184373c3c3fc91ced1c964d2a688d8eefbdf82011bb' 
  AND token = 'c3/R1GI7zxp1yvrTo+WVUqdPq+xVOqLZUNR4idd3GgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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