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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39d5d6c15059d7df9a54fddbe4f266ab610b2e1307cc1f78b6212680eb88b3a8' 
  AND token = '6kB7/HiH80SUy6PK2DBlEqRKDMHE8rCDy7+Z7RDSUHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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