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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d976b7e7ce8aef946d6a8c87f466d984b6ae1309c5e7314f0c1c806cd941673' 
  AND token = 'MaMrwaX0vZ+21N6MrEBoy3q5qnsQqjv2gkJMCsVjtm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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