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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b23e0c9d10f93e1aa86570f08f88ba8f5ae2f11f318daaa8acdee9ab76d66d89' 
  AND token = 'cYLeEGj8+tgS/KzLKAmKJTWa6micV5NdsHko/XFrMvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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