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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a74e85dac5dc95ea3a6a4d467edb2f5757f1b0eba1e9244ec5f12771276dec0' 
  AND token = 'XBJiHreNa7pWdL0lHldGclD8TbSGvG4Uj79M2jTNKbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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