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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3055b43ac876849ac244dbaa17b2724c138846c674dd8b8a02e1090b7f2d0107' 
  AND token = 'QTo03UG3zjBcEndOXzvazVyvuWQj40c7K219DqrMAQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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