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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '663f75869dc4a71bd443d7c1c38bb10ac46cc298bcfdc3360e9e9c16b96ff2f0' 
  AND token = 'd3te0pOL/TMnj2R/r19S0ouG3wZxXqKW7bEH0Ofo8wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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