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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e60f9a4f09a2656376d5b573bfec61c695be04199bbb401c7c709948c5db1dcb' 
  AND token = 'JaLXHh6XmgatJRe3giHNEEupS47hoe2CekRt226tnTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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