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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2046996e4304a4fd385a57007f6593eb02d42730fa0d5ac80b5b591cf791d50' 
  AND token = '1BCMZd7aD9rMSObVfjdtrG7i/czSwjN9y6NLhbbG5zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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