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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '498c1786ceec0d04955ea95df479b1b38029a200de7d6decfa1f8890ade0b2ca' 
  AND token = 'oEBid1K0VTLR7zApYJsSOAX0f65Mlci42DTA1yzzKC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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