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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1ea4a093aa1e908db39724544599b2bf97e845b8727b2eeebb81e19d276b848' 
  AND token = 'Rf8niIljlOhMX4ndpvUnspN0SbpyimmGNjFD8MqslWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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