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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef96eef7824d9ac25c8c6615ad791a786816f421d4257590a385149e75583218' 
  AND token = 'DjyvkHq3S+PadOYx632pa7w0Qnz7nxmppFydRUIYnmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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