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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d7aeef9be6d7729c77ce18d0b8708dc57d7ac13d1267e2910d1e9a5bad8ff8e' 
  AND token = 'xSrOI/146VImWeC38+ccUH6F8RjqZbL6POas4LEL2F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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