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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9424c6d56c356d1a693bd52247c2b5285912c9469f45de04c3aba69071c9fb58' 
  AND token = 'LCA41mvo/WHt36SUtbnYb0e+GNy9d2sPWd5dpdIwWZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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