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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '557be3e49485f0a915ec0f7fb02be09f1a7e222888d92d428fced3a046c572af' 
  AND token = 'XnxaDS4jnGZQpyFjgf5daqm8LE4yCW0S1wpk2v/1tTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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