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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2350811f97af823c270accf8e6116f19bb944e1031aa047f1b9d2556cc5d7acf' 
  AND token = 'FWYlZbCxpZapaiSVoe8gdYcSouKpUH8r5eIFCZ0rxc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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