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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0cb3b599b664edb1f4c6ff9becffd1a0062a448c72b17ed0dc7de34518575be' 
  AND token = 'P3eL4bJnY9eA3dycHj1Kaw/eMcsIDZJGSWP7dIxwE+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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