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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '211323e6dabfc985db2150c07cb637f49f6e5532b5b443fe58569426c63b8006' 
  AND token = '9BMfsNEmNFvKJktPQ7od11QPoioGIwp5jA06wzuovEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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