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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cc7756f74ed4a73f9b44c13d09cdfa1863642265840a83e3015b1caab8bd004' 
  AND token = '4tXecsvy99atICr5hAfbzrAdx9enGKjTG/YxC8FFhrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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