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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cf66a7567366279d69d78eb0cc06af943130a4f8052316548bdbe1c97740ed9' 
  AND token = 'le1fmdFYz5PX871/CK9t94gcOgnY9f8Y+OlMXrLghAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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