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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba2be79e31e7322a99ce55c369fef6ceeff457a464e6848d738d9631c85a7a3c' 
  AND token = 'PYHmk9HJfy9KVz5AHVLomsrFIze4U853qyEbmQcRrXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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