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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab83b320b5cb2ed32a78324bc6e1a596f545096ebdfd795469cbdea53b3b3e45' 
  AND token = '8/kjaqB0WMHe2s9i1aPpFJZny24FCR628NZNJRLQano=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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