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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a2cca35da6f1b57d10a4346d10af5c548fae6c462b6558cf1e4157f24a0f2fe' 
  AND token = 'Hh4wu7KrNtKoNZmrTgjkbY7KYmhZH7TGGkaSSgT1UjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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