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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cb7f34f8ad780c4517014b325568588cb47648dcea3d79180e070198e7acdfe' 
  AND token = 'Lfq7RWisRsykeRChjj0VUEd0DkfqeCQVZkIZbmMx1uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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