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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1d0fd7a015b9a24f2bcb927b381824bb1e8b5b6d5a272026dab01176b479e48' 
  AND token = 'P+xs5UnWH7iHn8k2B9lSsrjNLjy79cds9K1pBcnp7wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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