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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e562670330700b89e05bf0c1befa5df0bf2016663ce754df477ae3f52e69cef0' 
  AND token = 'i4cwgmmZLvg2VPdW7N166yTADT6KIJpzy3qt6LSh+54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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