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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd976a55c9085bb865aa6ad2c130e443abef0422da326d7e2c622aca803896805' 
  AND token = 'lxVsCKkSowKD+/DuDnxxeR5RBKHRFce5Dz6zHgCou2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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