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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef9c3b01c113e1ab62f242f99380daa01d43acc91662ab24466101c38f31f420' 
  AND token = 'UX2fllTL8tOFl5I0OsfptZrUY1oESCqO1X2/rbwDk9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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