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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f06aa9d9fcb3d71da03b3ff924ec64afb96f973b13e7a48ee890ea0cbdd5dd4' 
  AND token = 'jAY79IzMerOublL2nH0NBXUd9p5K/NRd394GdAqYwN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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