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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '651b1f962942ddcd199a9e9af84fff04da946fd96c66132d640b377d55b7506f' 
  AND token = 'Bx0pslleAfXifYQfRvvkS9LSn5J2/1XhSVPMQLSlizY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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