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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d7be1f9286e7192a18f3a349d81b34d7ba690ec53530aa5034e7ee5785effd7' 
  AND token = 'z7nRl7WWdlBymJB0Sx4zlBDQ1piogc/8rDzx10AEqsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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