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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93f3e5ee9afadb970bab72ef112e8ab158bf515bdb68872f01f7c2881def5019' 
  AND token = 'IL83ZcplUZCfwgm5IYc0okFKuHkOIABre87yH7PK1oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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