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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceaf7149d8c92fe9952ac619e62d5f1239a93cb9f0e3d9482dde87bd4b19733b' 
  AND token = 'EMBLUgzh7EdCGJTRplPyx0GG9N31yEuDIUC7LssMX8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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