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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24931aeb0be1cbcf5d4766b1eab9c47e9658b4433fcd7362dddfd551cbf5aeec' 
  AND token = '0u6nGCB/qEp62DsV2W+HqFiERB5541U0yD+R0vUw8ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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