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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd13c25ec8e71f61094d575b51d98144bb7085f9703b7150e797c142ada33076b' 
  AND token = 'eZzTeqXR5I/D87zldRj07AJFCG9hPzapmRLl78snTP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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