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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bd1fde5c985f66bbd789f107d74aa7c93bd63c57c060469aa68dbe7f8c27409' 
  AND token = 'QjjmAD5HdZMrdUohlc0lUFjSvTSQsUIypizAt9/53x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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