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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aed1fd9cfcd4e575fd367beeb37f7de62329406645662ea2aadaaeef2afa5db' 
  AND token = 'KG/dfw4+5M+jpHd0ZBPhFHQ9xPBq7JbvkxUke0THbgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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