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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ca865dc53bd9c7bea2d6aa5c13f325e1dda756a387bed308e97a8e9a0311a4f' 
  AND token = 'Xic2Np8RbRV3dCMcPrBBYgd0O2tRBrMj1lBdbJVRPvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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