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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8d26bf2c6bf08c23f5cb6df0bb777ae00180030aeb8c916ae0b14a5f71a05b0' 
  AND token = 'O8SmuY1lmC24fZ+LSvKsS7cO2EVSHmNHQqh1bhazmco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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