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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd30f4c6f6773d641c5080c48e3f41bea3921792fc35d756d983ce2b2cce2768' 
  AND token = 'N7MhwWdypTACVe+QaaVqyNsPuWXFqc6MPq4JP0LcQa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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