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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23375a3d3a61b7fff9c3a3991b1375e13d9e49be5122ba55c0efc7ae566955dd' 
  AND token = 'bVqJlbrJ56Qa9RW0B4PxqQ1TpiJ1Cbk2E9kXjH0Iz8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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