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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6abb514d057e960a6a733f1c2c1e7e746f4945f66d91d36cc172a339ede7063' 
  AND token = 'FX2gukWj0SmBvUXgbamSrkrko3XqwnDwY71PmzjaFBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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