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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f5f587d1c2721368e3493a202f789ce6ab6e559bc68ea5ad56bba0c85193ee6' 
  AND token = 'VaJ1TXXHvMmi6XG1rUv9IyoA2cIUX8ZXq298LZt10uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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