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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39cbd1298574dc1e5a958173be755062147264866e01e527edf1fae7dcbcb1bd' 
  AND token = 'mia7bCX5VYdyyA9zPoi8newvh6npM2TNhFhADgDWmYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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