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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '092e5036dac8bcce934111ff51d266d7c03e682d87999c9441efede39d11e9b7' 
  AND token = 'c0iBNuWbSuP4sqLnk1qG2BnN1LP+kCcLKwdcp2S3y7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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