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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d43065724135c8245f719338d4709d20fbfc8ecbc55dea6e1f369e5d6d21ad3' 
  AND token = 'urbjN398R/3Int/2aerNqn0jbTLycAprsWV6ommICL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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