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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57691a6dcf80a1f42893f8e8d3aae7de4bdbe74c939e04f740ec83140bc4fd96' 
  AND token = 'HEDm1ifUcMDm2iUMPPS8ruvDgJo3/oSZugei9F54GqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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