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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0d46f5607f86da19fab83e9dae15aad70a94330995002b2870a585ec7dd0223' 
  AND token = 'lPwVUMlJqVYnPyi01Y6cPLc4mHTktLX5epR/ZXs0WdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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